<template>
  <div>
      <!-- 面包屑导航区 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图区域 -->
      <el-card>
         <!-- 2.为 ECharts 准备一个定义了宽高的 DOM -->
          <div id="main" style="width: 600px;height:400px;"></div>
      </el-card>
  </div>
</template>

<script>
// 1.导入echarts
import * as echarts from 'echarts'
import _ from 'lodash'
export default {
  data () {
    return {
      options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: 'value'
          }
        ]
      }
    }
  },
  created(){},
  // 此时页面上的DOM元素已经被渲染完毕了
  async mounted(){
     // 3. 基于准备好的dom，初始化echarts实例
      var myChart = echarts.init(document.getElementById('main'));
       // 4. 指定图表的配置项和数据
      const { data: res } = await this.$http.get('reports/type/1')
      if(res.meta.status !== 200){
        return this.$message.error('获取图表数据失败！')
      }
      // 提供的merge函数
      const result= _.merge(res.data,this.options)
      // 5.使用刚指定的配置项和数据显示图表。
      myChart.setOption(result);
  },
  methods:{}
}
</script>

<style lang="less" scoped>

</style>